By Ali Lyon Elon Musk’s antitrust lawsuit against brands that have boycotted X and his controversial activity on the platform during the recent spate of UK riots are set to exacerbate the long-held misgivings advertisers have with the site, leading industry figures have said. On Tuesday, Elon Musk’s X – formerly Twitter – filed a lawsuit against a marketing trade body and string of major advertisers including Unilever and Mars for an “illegal boycott” on the platform which – the claim said – violates antitrust legislation. In a post from chief executive Linda Yaccarino, the firm said it was su…